Staedtler Arco 8 Piece Compass Set (559 09BK) Drafting type: Arco compass set / Material: Metal Maximum circle drawn: 15 3/4" or 19 5/8" with extension bar Two all-metal compasses with screwed knee joints in drawing leg and pivotal needle point Includes extension bar, divider, interchangeable springbow, pen part and handle, and spare parts tube